Note 11 Employee Equity Incentive Plans (Share-based Compensation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended				12 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Mar. 31, 2013	Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Selling, General and Administrative Expenses	$ 1,036		$ 798		$ 2,131		$ 1,582
Stock-based Compensation Effect in Income Before Taxes	1,036		798		2,131		1,582
Provision for Income Taxes	363	[1]	287	[1]	746	[1]	570	[1]
Net Stock-based Compensation Effects in Net Income	$ 673		$ 511		$ 1,385		$ 1,012
Estimated Statutory Income Tax Rate									35.00%	36.00%

[1] Estimated at a statutory income tax rate of 35% in fiscal year 2013 and 36% in fiscal year 2012.